Bending machine



Dec. 8, 1953 w. PEDDINGHAUS ETAL 2,661,786

' BENDING MACHINE Filed Dec. 21; 195o Looooooo oo ooooooall" INVENTORJ`WERNER PEDDlNHAUS Emu. FUNKE BY Patented Dec. 8, 1953 UNITED STATESBENDIN G MACHINE Werner Peddinghaus and Emil Funke, Gevelsberg, Germany,assignors to Paul Ferd. Peddinghaus,

Gevelsberg,

Germany, a German iirm Application December 21, 1950, Serial No. 201,912

Claims priority, application v(Siermany March 24, 1950 2 Claims.

This invention relates to bending machines and particularly to machinesfor bending steel rods and reinforcing irons.

Machines of this type are generally provided with an oscillatingremovable bending plate provided with holes for the insertion of boltswhich support bending rollers.

The creation of so-called double bents which are adjacent step-shapedbents, can only be effected in customary bending machines by replacementof the bending plate with a bending lever or arm of which the length atleast corresponds to the distance of the bent limiting points.

Consequently large bending arms are required and this is particularly soif heavy work pieces are bent and the bending levers reach far over thewidth of the bending table and endanger the working personnel. in orderto eliminate accidents protective devices must be applied generallyconsisting of semicircular protective plates shaped in conformity withthe operative range of the bending arm on the charging side of themachine and protective rails on the opposite side. These protectivedevices interfere with the servicing and the operation of the machineand cause the attendants to use bending plates in cases where the samedo not answer the operative requirements arising in bending large andheavy objects; consequently the economy of the operation is reduced, asthe adjacent double bents by the use of bending plates can only be madeby two successive steps. 1

' Moreover, a long bending arm necessitates a large size of the bendingtable and a higher power input.

It is the primary object of the invention to eliminate the above recitedeconomical and safety endangering disadvantages and shortcomings of theart.

It is a further important object of the invention to enable the bendingof large and heavy workpieces and particularly the production of doublebents in the same machine and to eliminate an exchange of the bendingarm in bending these large workpieces.

It is also an object of the invention to dispense with the hithertorequired voluminous protective devices.

It is a further object of the invention to greatly reduce the size ofthe bending machine without in any way diminishing its applicabilityparticularly in the production of double bents.

It is another object of the invention to render the bending machineeasily adjustable to the j? are spaced to permit small adjustments.

varying shapes and sizes of the objects to the bent.

With these and additional objects in View which will become apparent, asthis description proceeds, the invention will now be described in detailand with reference to the accompanying drawings which illustrate theinvention and the art to which it pertains.

In the drawings Figures 1-3 show views of a bending machine in itsvarious operating positions for the production of a reinforcing ironprovided with hookshaped and with double bents,

Figure 4 is a side view of the finished reinforcing iron.

In the bending device constructed in conformity with the invention andillustrated in'Figures 1 to 3 the bending crank arm 22 is actuated inthe direction of arrows 24 and 25 by a reversing gear which is locatedunderneath rectangular table 23. `Several bores 26 serve to take up thesupporting bolt of the bending roller 2S.

For the production of the double bents i8, I3 and 20, 2|, Figure 4, apair of bending rollers 29 and 30 is provided; these rollers areinserted into the holder strips 3| and 32 which extend in thelongitudinal direction of table 23. The holders are adjustably supportedon rails 32, 33 and 31|, 35 extending across table 23; the holes inthese rails A stepfree adjustment and therewith great accuracy of thebents may be obtained by an additional longitudinal and lateraladjustment of the rails 32, 33, 311i, 35 which maybe effected in anyknown manner, for example, by means of worm-gear spindles as indicatedat 36.

The bending device, illustrated in Figures 1 to 3 is operated, asfollows.

To produce the double bents I8, I9 and 20, 2|, Figure 4, respectivelyone bending roller 28 is inserted into the bending arm 22 and additionalrollers 29 and 30 are inserted into holders 3| and 32 respectively., Therod is entered between the rollers and the bending arm 22 is swung inthe direction of arrows 24 and 25 respectively.

The rod is propped by the adjustable abutments 39 or 4D and by alongitudinal horizontally extending abutment member 4| which isadjustable by insertion into holes provided in rails 32 and 35.

As apparent from Figures 1 and 2 the invention enables the production offar outreaching double bents with a comparatively small bending crankarm.

The reinforcing iron rod is in conformity abutment 40, the lever beingoscillated inthe` direction of arrow 25. The hitherto customaryprotective devices can be entirely spared.

The production of double bents is effected by means of a single pair ofrollers; the one roll oscillates with the crank arm.- andthe., otherone,

which cooperates with an abutment, is located on a support which isadjustable parallel to the bending table. Accordingly the length of thecrank arm is not dependent upon the distanceot the bending points;therefore the length of the crank arm can be greatly reduced.

The adjustability of the bending rollers, which are solidly supportedupon a holder of the. bending; table, may be attained by a varietyJi-measures..

A; particularly simple and useful construction results from theinsertion of the roller which cooperates with an abutment in arail'which extends parallelly to the longitudinalside of the bendingtable;l this rail is adjustableA by means of additional, hole providedrails which are mutually/ and parallelly adjustable.

The table dimensions which; are mainly dictated by the length'o thebending arm may be accordingly shortened and the weight of the machineessentially reduced. Moreover, the power consumption. issmaller asrwithv the hitherto customary rod bending devices, since the bendingforce'acts upon a much shorter crank arm.

Theinvention has been. described with referenceto a preferredembodimentcand it willl be understood that many variations andmodifications thereof may be resorted. to without departure from thescope of the invention as defined in the following claims.

We claim:

1. An apparatus for applying double' bends to steel rods and comprisinga ltiorizontall table, a

crank arm having one end rotatably mounted on the table for rotationabout a vertical axis, a first bending roller mounted on the other end;of the crank arm, a longitudinal horizontally extendingr'abutment membermounted on said table, the distancebetween the crank arm axis: ofrotation and said first bending roller being greater than the distancebetween said axis and said abutment member, means for holding one end ofa rod in a direction parallel to said abutment member, a second bendingroller adjacent said holding means and? located at thesi'deetheneofclosest to said abutment member and to said crank arm axis A. of.rotation, and means for mounting said holding means and said secondbending roller on the tabl'e,the distance between said bending rollerswhen .the nrst roller is adjacent said abutment memberbeing. greaterthan the distance between tlfxeV crankarm axis-of rotation and the iirstbending roller.

' 21 An apparatus: for applying double bends to steel. rodsand'comprising a horizontal table, a crank arm having one end rotatablymounted to the table for rotation about a vertical axis, a firstbending'v roller mounted on the other end of the crank arm, alongitudinal horizontally extending abirtment member mounted on saidtable, thedistance vbetween the crank arm/ axis of: rotation and; saidirst bending roller being greaterf'than the. distance between said axisvand said abutment member, means for holding one end of arod in adirection parallel to saidlabutment member, aseo# ond bending rolleradjacent said holding means: and located at the; side thereof: closest'tdsaid abutment member and' to said crank; ann axis: of rotation, andmeansy for mounting saidsecond bending roller in any selected*v one: ofseveral .posi-l tions on said table, said positions locating the axis ofsaid second bending roller ati varying distances from said abutment andsaid crank arm axisof.'

rotation.

WERNER PEDDINGHAUS.

References Cited-in the file-of4 thisV patent- UNITED STATES PATENTSNumber Name Date 1,479,762 Wagenbach Jari.4 1,. 1924v 1,610,201Cavagnaro ,Dec.7, 1926 1,683,366 Macomber V Sept., 4, 1.928 1,795,188Wagenbach Mar. 3, 1931 2,055,955 Wagenbach Sept. 2951936, 2,128,626Lyons Aug.y 30,1938 2,268,628 Siuszko Jan. 6., 19.42

FOREIGN PATENTS Number Country Date 546,650 Germany Mar. 1,4, :1932559,711 Germany Sept. 30, 1932

